CN101643305B - Method for integrating sludge drying by using brickkiln fume afterheat and brick making by using sludge - Google Patents
Method for integrating sludge drying by using brickkiln fume afterheat and brick making by using sludge Download PDFInfo
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- CN101643305B CN101643305B CN2009101019451A CN200910101945A CN101643305B CN 101643305 B CN101643305 B CN 101643305B CN 2009101019451 A CN2009101019451 A CN 2009101019451A CN 200910101945 A CN200910101945 A CN 200910101945A CN 101643305 B CN101643305 B CN 101643305B
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Abstract
The present invention discloses a method for integrating sludge drying by using brickkiln fume afterheat and brick making by using sludge. The method comprises the following steps of: 1) using an induced draught fan to send hot fume discharged from a brickkiln respectively to a first sludge drying and granulating device and a second sludge drying and granulating device, for purpose of two-stage sludge drying; 2) stacking urban sludge in a sludge storage warehouse and carrying out pretreatment prior to the drying; 3) using a component-type feeder to send the pretreated sludge into the first sludge drying and granulating device, for purpose of first-stage sludge drying; 4) using a conveyor to send the sludge after the first-stage sludge drying into the second sludge drying and granulating device, for purpose of second-stage sludge drying; and 5) granulating the sludge after the second-stage sludge drying; before the entrance into a sludge finished product warehouse, using a screening and separating device to uniformly mix sludge grains with brick-making clay or shale soil; and making adobes and sintering the adobes into light and energy-saving bricks. In the method, waster materials are used for treating waster materials, so that the urban sludge is harmlessly treated and recycled, and remarkable social and economic effects can be generated.
Description
Technical field
The present invention relates to a kind of brickkiln smoke residual heat to dry sludge and incorporate method of making brick from sludge utilized.
Background technology
In order to protect our limited water resource; create good living environment; sanitary sewage and industrial wastewater must be through the processing of sewage treatment plant; could discharge after reaching state sewage emission standard; whether have urban sewage treatment system; this has become the sign of a modern city civilization, also is the requisite environmental project measure of Urban Ecology Environment Construction.Eleventh Five-Year Plan according to national environmental protection Eleventh Five-Year Plan and processing of national town sewage and regeneration Facilities Construction, all to build sewage treatment facility to all cities of China in 2010, treatment rate of domestic sewage is not less than 70%, estimate that the National urban sewage treatment capacity will be above 100,000,000 ton per days, simultaneously can estimate that the mud of supervening (about moisture content 80%) will be up to 3,000 ten thousand tons/year, add and pollute lake, river dredging mud and municipal sewage system mud etc., not only quantity is very huge for the annual municipal sludge that produces, and annually also increases with 10～15% growth rate.How the disposal municipal sludge is handled on safety economy ground is the environmental problem that the world faces jointly, and it is very urgent especially concerning China to solve this global problem.
Municipal sludge is a kind of pathogeny microorganism, multiple organic and inorganic pollution of containing, and the solid-liquid mixture of heavy metal, in 192 kinds of compounds that from mud, are detected, there are 99 kinds to be confirmed as hazardous compound, therefore, mud is the great solid waste of a class harmfulness, if do not handle completely and control, will cause serious secondary pollution to environment.
At present, China mainly takes the interim method of disposal of burying of piling to sludge from wastewater treatment plant and lake, river dredging mud, not only spend a large amount of funds and take a large amount of land resource, and cause serious secondary pollution to ecological environment, particularly ooze under the sewage in the mud, be unable to estimate especially to the harm that groundwater resources bring, and in fact peri-urban can not have space and the place that is fit to stack this class mud, the interim heap of mud buries the harm of the secondary environmental pollution that is produced, and has in fact offset the environmental benefit of the sewage disposal and the training of channel.Face the reality that environmental problem is sharp-pointed day by day and mud harm increasingly sharpens that mud causes, people attempt utilizing the mud as fertilizer sources, be used for agricultural or greening, but, each contained heavy metal species has limited the adaptability (table 1) that soil utilizes mud in the mud, studies show that, from waste water, remove the heavy metal of 1mg/L, will in mud, accumulate the heavy metal of 10000mg/L, their meeting enrichments in soil, and enter food chain by the absorption of crop, finally jeopardize the health of human body, even some mud is from city domestic sewage, though content of beary metal is lower, but contained pathogen and persistence organic pollutant in the mud, and the various medicaments that add in the sewage disposal process all can bring potential harm to environment.
The content of heavy metal in table 1 municipal sludge and the dredging mud
Practice with reference to external sludge incineration, some places attempt to reach by burning the purpose of mud decrement, still, and sludge incineration equipment investment volume height, energy-output ratio is big, operating cost costliness, the expense of sludge incineration add that more than 400 yuan/ton mud is when burning, can to atmospheric environment bring pollute and burn after residue reason such as still need dispose, according to the national conditions of China, sludge incineration is handled and is difficult to economically bear, and goes back imperfection technically.
Along with increasing rapidly of China's rapid economy development and urban population, the quantity of municipal sewage is constantly increasing, meanwhile people are more and more higher to the requirement of environmental quality, improving constantly of industrial wastewater and city domestic sewage handling rate, the quantity that means sludge of sewage treatment plant will grow with each passing day, therefore, open up one municipal sludge carried out safety, economic effective processing approach, imperative.Practice shows that municipal sludge will be handled completely, must walk innoxious, minimizing and resource road.According to physicochemical property to sludge from wastewater treatment plant, carry out continuous 3 years studies show that, the main chemical compositions content in the mud little (table 2), this has illustrated the mud that the municipal sewage plant produces, its main chemical composition
The chemical composition of table 2 sludge from wastewater treatment plant
It is kept stable.The loss on ignition of mud is higher, on average reaches about 36%, and the content of full nitrogen and full phosphorus is also higher, and this shows and contains higher organic substance in the mud.Content of organic matter height in the mud, its calorific value is also high, shows by mensuration, and the calorific value of sludge from wastewater treatment plant is equivalent to the calorific value of brown coal, reaches the 1/3-1/2 (table 3) of standard coal calorific value; Content organic in lake, the river dredging mud is also higher, and according to the correlation between organic matter and the calorific value, its calorific value is also than higher.If the heat energy in the mud can be developed, not only can make municipal sludge treatment plant mud and lake, river dredging mud obtain thoroughly handling safely, and the heat energy that mud is had become valuable resource.
Table 3 sludge from wastewater treatment plant, dredging mud and burning of coal calorific value
Sludge of sewage treatment plant and lake, river dredging mud, pass through mechanical dehydration, moisture content is generally between 75%-85%, if mud can be burnt, must be at first the solid content of mud be reached 100%, this means needs a large amount of external energies, the calculating that is based upon on the experimental basis shows, will be with the complete after-flame of the mud of moisture content 75%-85%, make mud arrive the needed energy of burning-point, the energy that is produced much larger than the over dry sludge incineration.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of brickkiln smoke residual heat to dry sludge and incorporate method of making brick from sludge utilized is provided.
Utilize the incorporate method of brickkiln smoke residual heat to dry sludge and making brick from sludge to comprise the steps:
1) waste heat supply temperature that brickkiln is discharged is 120 ℃～200 ℃ a flue gas, delivers to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by air-introduced machine, carries out the two-period form sludge drying;
2) water content being accounted for the gross weight mass percent is 80～85% sludge from wastewater treatment plant, or river, lake dredging mud, stacks 3～5 days at the mud storage vault, and carries out the preceding preliminary treatment of sludge drying with turning over the machine of mixing;
3) will by the component type charger, mud be sent into the first sludge drying granulating apparatus through pretreated mud, carry out the phase I sludge drying;
4) through the mud of phase I mummification,, send into the second sludge drying granulating apparatus, carry out the second stage sludge drying by conveyer;
5) through above-mentioned two-period form drying process, mud is in mummification, naturally forming the hard particle diameter of quality is the mud granule of 1～8mm, and the mud granule passes through screening plant when entering the mud warehouse for finished product, with particle diameter 2～6 mud granule and brick clay or the abundant mixing of white bind, make adobe earlier, sinter brick then into, the mass ratio of mud granule and brick clay or white bind is 1: 0.05～0.2, less than 2 millimeters with greater than 6 millimeters mud granule, as the coal-fired auxiliary fuel of baking bricks.
The barrel diameter of the described first mummification granulating apparatus is 2.0～2.4m, and length is 22～28m.The barrel diameter of the described second sludge drying granulating apparatus is 1.8～2.2m, and length is 20～26m.In the cylindrical shell of the described first sludge drying granulating apparatus and in the cylindrical shell of the second sludge drying granulating apparatus, the lifting blade and the chain hammer that mud are further disperseed and help the mud granulating are housed.Described through discharge tail gas behind first sludge drying and the second section sludge drying, through qualified discharge after the dedusting degassing processing; The gas that preliminary treatment and mud warehouse for finished product discharge before the sludge drying is eliminated by the geobiont filter bed.
The present invention compared with prior art has beneficial effect:
1) utilizes the brickkiln smoke residual heat to dry sludge, not only can be under the situation that does not consume new forms of energy, the moisture content of sludge of sewage treatment plant and lake, river dredging mud is reduced, and the discharged flue gas waste heat of baking bricks is fully used, thereby opened up the new way of a treatment of wastes with processes of wastes against one another, the cyclic utilization of waste for innoxious, minimizing, the recycling treatment of municipal sludge, significant social and environmental benefit can either be produced, tangible economic benefit can be obtained again.
2) utilize the brickkiln smoke residual heat to dry sludge, because thermal source intercepts from flue, the exhaust gas volumn size of intercepting can be controlled by air door, and therefore, when the sludge drying granulating apparatus need overhaul, flue gas still can smooth and easyly be discharged, and can not influence the normal operation of brickkiln.
3) the present invention utilizes the brickkiln fume afterheat, make mud under cryogenic conditions, obtain mummification, thereby kept the original calorific value of mud, mud granule brickmaking after the mummification, sludge from wastewater treatment plant and lake, river dredging mud is handled completely, the heat resource of mud is farthest utilized.
4) the brick body of firing with 5～20% mud granules, not only compression strength reaches the standard of high-quality brick, and is a kind of light energy saving brick, and has the characteristics of insulation.Table 5 and table 6 have provided the test result and the national standard of mud light energy saving brick respectively.
Table 5 mud light energy saving brick intensity test result
The national standard (GB5101-85) of table 6 different brackets common brick compression strength
Annotate: be engineering system unit, 1kgf/cm in the table in ()
2=0.0981Mpa
Description of drawings
Accompanying drawing is the process chart that utilizes brickkiln smoke residual heat to dry sludge and making brick from sludge.
The specific embodiment
The present invention utilizes brickkiln discharged flue gas waste heat, earlier with sludge drying, and forms granule in sludge drying, then, evenly mixes according to a certain percentage with brick clay or white bind with the mud granule after the mummification, makes adobe, is fired into brick at last.There are evident difference (table 4) in municipal sludge and brick clay and shale in chemical composition and mineral composition, therefore, if according to general method, mix simply after mud and clay or shale pulverized, the common brick body of firing, even the ratio that mud mixes is very little, also can't reach the standard of compression strength.Use the mud granule, pulverize the back with clay or shale according to a certain percentage and fully mix, make adobe, not only make every brick body can utilize more mud, and through high-temperature roasting, after organic matter transformation in the mud is heat energy, in the inner formation of brick body circular hole, because circular hole is on three dimensions, wall is arch form, therefore, in the advantage that has in the resistance to compression on the mechanics, the brick body that forms of sintering has the characteristics of lightweight, energy-conservation and insulation thus.This for realize that municipal sludge is innoxious completely, minimizing and recycling treatment opened up a new way.
The main chemical compositions of table 4 clay and mud
1. clay is from Hangzhou red flag Bricks and Tiles Plant;
2. shale picks up from Fuyang, Zhejiang;
3. the mean value analyzed for 3 times of Hangzhou Si Bao sludge of sewage treatment plant 1993,1996, calendar year 2001.
Utilize the incorporate method of brickkiln smoke residual heat to dry sludge and making brick from sludge to comprise the steps:
1) waste heat supply temperature that brickkiln is discharged is 120 ℃～200 ℃ a flue gas, delivers to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by air-introduced machine, carries out the two-period form sludge drying;
2) water content being accounted for the gross weight mass percent is 80～85% sludge from wastewater treatment plant, or river, lake dredging mud, stacks 3～5 days at the mud storage vault, and carries out the preceding preliminary treatment of sludge drying with turning over the machine of mixing;
3) will by the component type charger, mud be sent into the first sludge drying granulating apparatus through pretreated mud, carry out the phase I sludge drying;
4) through the mud of phase I mummification,, send into the second sludge drying granulating apparatus, carry out the second stage sludge drying by conveyer;
5) through above-mentioned two-period form drying process, mud is in mummification, naturally forming the hard particle diameter of quality is the mud granule of 1～8mm, and the mud granule passes through screening plant when entering the mud warehouse for finished product, with particle diameter 2～6 mud granule and brick clay or the abundant mixing of white bind, make adobe earlier, sinter brick then into, the mass ratio of mud granule and brick clay or white bind is 1: 0.05～0.2, less than 2 millimeters with greater than 6 millimeters mud granule, as the coal-fired auxiliary fuel of baking bricks.
The barrel diameter of the described first mummification granulating apparatus is 2.0～2.4m, and length is 22～28m.The barrel diameter of the described second sludge drying granulating apparatus is 1.8～2.2m, and length is 20～26m.In the cylindrical shell of the described first sludge drying granulating apparatus and in the cylindrical shell of the second sludge drying granulating apparatus, the lifting blade and the chain hammer that mud are further disperseed and help the mud granulating are housed.Described through discharge tail gas behind first sludge drying and the second section sludge drying, through qualified discharge after the dedusting degassing processing; The gas that preliminary treatment and mud warehouse for finished product discharge before the sludge drying is eliminated by the geobiont filter bed.
Embodiment 1
Special-purpose mud waggon is that 82% sludge from wastewater treatment plant is sent into the mud storage vault with moisture content, stacked 4 days, and mix machine and make the mud homogenising on the one hand with turning over, make mud natural evaporation portion of water on the other hand, the mud storage vault discharges gas, send into biological soil filter bed, qualified discharge by air-introduced machine.
Through pretreated mud, moisture content reduces to 80%, by the component type charger, mud is sent into the first sludge drying granulating apparatus by certain time interval, carry out the phase I sludge drying, the first sludge drying granulating apparatus diameter is 2.2m, long be 25m, air-introduced machine is 170 ℃ brickkiln discharging flue gas, sends into the first sludge drying granulating apparatus and moisture content and is 82% mud and directly contact, hot flue gas heating mud, make the part water evaporates in the mud, the moisture content of evaporation is discharged with the form of tail gas with flue gas, passes through air-introduced machine, through wet dust removal degassing apparatus, qualified discharge.Through the mud after first section mummification, moisture content reduces to 62%.
Will be through the mud of first section mummification, pass through conveying worm, send into the second sludge drying granulating apparatus, carry out the second stage sludge drying, the second sludge drying granulating apparatus diameter is 2.0m, long is 22m, air-introduced machine discharges flue gas with 170 ℃ brickkiln, send into the second sludge drying granulating apparatus and moisture content and be 62% mud and directly contact, hot flue gas heats mud once more, makes the part water evaporates in the mud, the moisture content of evaporation is discharged with the form of tail gas with flue gas, by air-introduced machine, through wet dust removal degassing apparatus, qualified discharge.Through the mud after second section mummification, moisture content reduces to 45%.
Through above-mentioned two-period form drying process, mud is in mummification, naturally forming the hard particle diameter of quality is the mud granule of 1～8mm, when this mud granule enters the mud warehouse for finished product by conveyer, passes through screening plant, particle diameter is that 2～6 mud granule is as the raw material of baking bricks, the ratio in 10% and the abundant mixing of clay of baking bricks are made adobe earlier, sinter brick then into, less than 2 millimeters with greater than 6 millimeters mud granule, as the coal-fired auxiliary fuel of baking bricks.Enter the mud granule of mud warehouse for finished product,, send into biological soil filter bed, qualified discharge by air-introduced machine at the gas that cooling procedure discharges.
The mud granule in 10% ratio with bake bricks the abundant mixing of clay, the brick body that sinters into, compression strength reaches the requirement of top grade brick, mass ratio is light by 8% with the common brick of volume.
Embodiment 2
Special-purpose mud waggon is that 80% sludge from wastewater treatment plant is sent into the mud storage vault with moisture content, stacked 5 days, and mix machine and make the mud homogenising on the one hand with turning over, make mud natural evaporation portion of water on the other hand, the mud storage vault discharges gas, send into biological soil filter bed, qualified discharge by air-introduced machine.
Through pretreated mud, moisture content reduces to 78%, by the component type charger, mud is sent into the first sludge drying granulating apparatus by certain time interval, carry out the phase I sludge drying, it is 2.4m that first dewatered sludge changes into an assembly dia, long be 28m, air-introduced machine is 180 ℃ brickkiln discharging flue gas, sends into the first mummification granulating apparatus and moisture content and is 78% mud and directly contact, hot flue gas heating mud, make the part water evaporates in the mud, the moisture content of evaporation is discharged with the form of tail gas with flue gas, passes through air-introduced machine, through wet dust removal degassing apparatus, qualified discharge.Through the mud after first section mummification, moisture content reduces to 58%.
Will be through the mud of first section mummification, pass through conveying worm, send into the second sludge drying granulating apparatus, carry out the second stage sludge drying, the second sludge drying granulating apparatus diameter is 2.1m, long is 23m, air-introduced machine discharges flue gas with 180 ℃ brickkiln, send into the second sludge drying granulating apparatus and moisture content and be 58% mud and directly contact, hot flue gas heats mud once more, makes the part water evaporates in the mud, the moisture content of evaporation is discharged with the form of tail gas with flue gas, by air-introduced machine, through wet dust removal degassing apparatus, qualified discharge.Through the mud after second section mummification, moisture content reduces to 40%.
Through above-mentioned two-period form drying process, mud is in mummification, naturally forming the hard particle diameter of quality is the mud granule of 1～8mm, when this mud granule enters the mud warehouse for finished product by conveyer, passes through screening plant, particle diameter is that 2～6 mud granule is as the raw material of baking bricks, the ratio in 15% and the abundant mixing of clay of baking bricks are made adobe earlier, sinter brick then into, less than 2 millimeters with greater than 6 millimeters mud granule, as the coal-fired auxiliary fuel of baking bricks.Enter the mud granule of mud warehouse for finished product,, send into biological soil filter bed, qualified discharge by air-introduced machine at the gas that cooling procedure discharges.
The mud granule in 15% ratio with bake bricks the abundant mixing of clay, the brick body that sinters into, compression strength reaches the requirement of top grade brick, mass ratio is light by 12% with the common brick of volume.
Claims (5)
1. one kind is utilized brickkiln smoke residual heat to dry sludge and the incorporate method of making brick from sludge, it is characterized in that comprising the steps:
1) waste heat supply temperature that brickkiln is discharged is 120 ℃～200 ℃ a flue gas, delivers to respectively in the first sludge drying granulating apparatus and the second sludge drying granulating apparatus by air-introduced machine, carries out the two-period form sludge drying;
2) water content being accounted for the gross weight mass percent is 80～85% sludge from wastewater treatment plant, or river, lake dredging mud, stacks 3～5 days at the mud storage vault, and carries out the preceding preliminary treatment of sludge drying with turning over the machine of mixing;
3) will by the component type charger, mud be sent into the first sludge drying granulating apparatus through pretreated mud, carry out the phase I sludge drying;
4) through the mud of phase I mummification,, send into the second sludge drying granulating apparatus, carry out the second stage sludge drying by conveyer;
5) through above-mentioned two-period form drying process, mud is in mummification, naturally forming the hard particle diameter of quality is the mud granule of 1～8mm, the mud granule is when entering the mud warehouse for finished product, pass through screening plant, with particle diameter is mud granule and brick clay or the abundant mixing of white bind of 2～6mm, make adobe earlier, sinter brick then into, the mass ratio of mud granule and brick clay or white bind is 1: 0.05～0.2, less than 2 millimeters with greater than 6 millimeters mud granule, as the coal-fired auxiliary fuel of baking bricks.
2. a kind of brickkiln smoke residual heat to dry sludge and incorporate method of making brick from sludge utilized according to claim 1, the barrel diameter that it is characterized in that the described first mummification granulating apparatus is 2.0～2.4m, length is 22～28m.
3. a kind of brickkiln smoke residual heat to dry sludge and incorporate method of making brick from sludge utilized according to claim 1, the barrel diameter that it is characterized in that the described second sludge drying granulating apparatus is 1.8～2.2m, length is 20～26m.
4. a kind of brickkiln smoke residual heat to dry sludge and incorporate method of making brick from sludge utilized according to claim 1, it is characterized in that in the cylindrical shell of the described first sludge drying granulating apparatus and in the cylindrical shell of the second sludge drying granulating apparatus, the lifting blade and the chain hammer that mud are further disperseed and help the mud granulating are housed.
5. a kind of brickkiln smoke residual heat to dry sludge and incorporate method of making brick from sludge utilized according to claim 1 is characterized in that through discharge tail gas behind first sludge drying and the second section sludge drying, through qualified discharge after the dedusting degassing processing; The gas that preliminary treatment and mud warehouse for finished product discharge before the sludge drying is eliminated by the geobiont filter bed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101019451A CN101643305B (en) | 2009-08-20 | 2009-08-20 | Method for integrating sludge drying by using brickkiln fume afterheat and brick making by using sludge |
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| CN2009101019451A CN101643305B (en) | 2009-08-20 | 2009-08-20 | Method for integrating sludge drying by using brickkiln fume afterheat and brick making by using sludge |
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| CN101643305B true CN101643305B (en) | 2011-07-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101811815A (en) * | 2010-05-10 | 2010-08-25 | 李兴 | Tail gas-heated organic heat carrier equipment dried sludge reutilization method |
| CN102964047B (en) * | 2012-07-23 | 2015-01-07 | 北京水泥厂有限责任公司 | Treatment method of sludge drying |
| CN103739181A (en) * | 2013-10-18 | 2014-04-23 | 陈丰 | Biochemical sludge reclamation drying treatment system |
| CN104163556B (en) * | 2014-07-24 | 2016-06-01 | 浙江大学 | Printing and dyeing mill's sizing waste gas is utilized to mix system and the method thereof of Heat Treatment printing and dyeing sludge with boiler smoke |
| CN105130154B (en) * | 2015-08-06 | 2018-01-26 | 浙江大学 | Sludge drying and granulating integrated system and method with dedusting function |
| CN111303957A (en) * | 2020-03-11 | 2020-06-19 | 杨力发 | Biomass fuel based on fly ash and sludge, and preparation method and application thereof |
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